{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["machanical property", "process characterization", "machine or equipment", "material", "concept or principle"], "input": "In fusion zone , due to acicular α′ formation , the microhardness is higher than base metal and heat affected zone ."}
{"machanical property": [], "process characterization": [], "machine or equipment": [], "material": ["base metal"], "concept or principle": ["fusion zone", "microhardness", "heat affected zone"]}